new manifold

Hi
I bought Hoppen's RS2 manifold from USA to install in my
S4. I have a big problm when German mechanics (old man) said that
1. It is very difficult to replace the manifold.
2.he's not sure whether the engine of RS2,US-SPEC S4,and ones in
Thailand is the same (are they stupid or somethin..?)
3.He like to call AUDI AG Germany whether there are big benefits of
RS2 header alone without the turbo,if the answer they got is no,they
want do this job for us.
So I have to work again,I faxed Hoppen ,I faxed road test
result od Hoppen S6 to them(those mechanics). These are hoppen's
answer
1.It's easy to replace ,but time consuming (about 7 hr.!!!)
2.All of those engine have the same cylinder head.
3.there are many benefits.
This time I sent the above message to those mechanics again..and
at this moment my S4 is RS2 header installed. Haven't had a
chance for test drive yet,but dad already ddrive it. Dad said
the car has better low speed respond,but at high speed..haven't
try.
That's story.